21874858615871 has 8 divisors (see below), whose sum is σ = 21903106130640. Its totient is φ = 21846620199168.

The previous prime is 21874858615861. The next prime is 21874858615891. The reversal of 21874858615871 is 17851685847812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21874858615871 - 2⁴² = 17476812104767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21874858615795 and 21874858615804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874858615861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543855 + ... + 7086671.

It is an arithmetic number, because the mean of its divisors is an integer number (2737888266330).

Almost surely, 2^{21874858615871} is an apocalyptic number.

21874858615871 is a deficient number, since it is larger than the sum of its proper divisors (28247514769).

21874858615871 is an equidigital number, since it uses as much as digits as its factorization.

21874858615871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549033.

The product of its digits is 240844800, while the sum is 71.

The spelling of 21874858615871 in words is "twenty-one trillion, eight hundred seventy-four billion, eight hundred fifty-eight million, six hundred fifteen thousand, eight hundred seventy-one".